A parallelogram has height 45 cm and base 60 cm.

a. find its area.

b. what is the base and height of a parallelogram with twice the area?

c. what is the base and height of a parallelogram with one-half the area?

(a) Area of the parallelogram = 45 x 60 = 2700 cm²

Ratio of height : base = 45 : 60 = 3 : 4

When the area is doubled, area = 2700 x 2 = 5400 cm²

Let x be the factor,

(3x) (4x) = 5400

12x² = 5400

x² = 450

x = √450

x = 21.21

Height = 21.21x3 = 63.63

Base = 21.21x4 = 84.84

(b) The base is 84.84 cm and the height is 63.63cm.

When the area is halved, the area is 2700 : 2 = 1350 cm²

(3x) (4x) = 1350

12x² = 1350

x² = 112.5

x = √112.5

x = 10.61

Height = 10.61 x 3 = 31.83 cm

Base = 10.61 x 4 = 42.44 cm

C) The height is 31.83 cm and the base is 42.44 cm.